Althoughthecausesofcancer,wedo

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Although the causes of cancer_____, we do not yet have any practical way to prevent it.

A．are being uncovered	B．have been uncovering
C．are uncovering	D．have uncovered

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相关试题

______ to the man’s timely coming, the ______ boy was saved.

A．Thanking; drown

B．Thanks; drowned

C．Thanked; drowns

D．Thanks; drowning

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- Mr. Black, what about my application?
- Oh, I regret ______ you that it hasn’t been successful.

A．telling

B．to tell

C．having told

D．said

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It is required that the football match ______ put off ______ the bad weather.

A．be; thank to

B．be; due to

C．was; thanks to

D．was; owing to

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The business has ______ from having one office to having twelve branches.

A．expanded

B．exploded

C．cracked

D．burst

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The children talked so loudly at dinner table that I had to struggle ______.

A．to be heard

B．to have heard

C．hearing

D．being heard

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